72km/hr വേഗത്തിൽ സഞ്ചരിക്കുന്ന 140മീ നീളമുള്ള തീവണ്ടിക്ക് ഒരു ടെലിഫോൺ പോസ്റ്റ് കടന്നുപോകുന്നതിന് വേണ്ടസമയം.
A7 സെക്കൻഡ്
B7 മിനിറ്റ്
C5 സെക്കൻഡ്
D5 മിനിറ്റ്
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